The developmental aspects of the sport are extremely limited after you are 22-23. What would help the sport would be a select set of regional meets in XC/Track that have minimal to no rewards financially, but an opportunity for the maybe 100 runners every year who are at 13:xx-15:xx talent level and could make 1-5 runners become mid 13's or lower because they are given a platform to do so.
The HS/NCAA platform provides short term development and a lot of athletes rush or over train to get as much potential out of themselves in those years. This circuit would provide older runners who want a competitive atmosphere in races a chance to mix it with younger kids too.
It isn't an idea that will revolutionize running, I just feel like it provides the opportunity for more closely contested races to happen throughout the year.
This is an abstract idea, I am not the only one who has thought of. I hope it gets some discussion